.calc-container{display:flex;flex-direction:column;gap:15px;max-width:300px;margin:50px auto;padding:20px;border:1px solid #ccc;border-radius:8px;font-family:Arial,sans-serif;background-color:#fff;box-shadow:0 4px 6px #0000001a}input{padding:10px;font-size:16px;border:1px solid #ddd;border-radius:4px}.buttons{display:flex;gap:10px}button{flex:1;padding:10px;cursor:pointer;background-color:#f0f0f0;border:1px solid #999;border-radius:4px;font-weight:700}button:hover{background-color:#e0e0e0}.result{text-align:center;color:#2c3e50;margin-top:15px}